,1. Which of the following best describes the primary function of the negative feedback
mechanism in the human body?
A) To promote the completion of a response initiated by a particular stimulus
B) To maintain a state of dynamic equilibrium and consistency despite changing environments
C) To amplify a change from a set point to produce a rapid physiological response
D) To initiate the response to a stimulus by sending signals to the effector
Correct Answer: To maintain a state of dynamic equilibrium and consistency despite changing
environments
Rationale: Negative feedback is the main method for maintaining homeostasis, working to
reverse a change from a set point . This is in contrast to positive feedback, which promotes the
completion of a response. The sensor, control center, and effector work together in this loop to
restore balance .
2. The lungs are located in which of the following body cavities?
A) Abdominal cavity
B) Pelvic cavity
C) Thoracic cavity
D) Mediastinum
Correct Answer: Thoracic cavity
Rationale: The thoracic cavity is the superior cavity of the ventral body cavity and houses the
lungs, heart, and other structures . The mediastinum is a subdivision of the thoracic cavity that
specifically contains the heart, but the lungs are in the broader thoracic cavity itself .
,3. What is the correct sequence of structural organization in the human body from simplest to
most complex?
A) Cells → tissues → organs → systems → organism
B) Tissues → cells → organs → organism → systems
C) Organs → tissues → cells → systems → organism
D) Organism → systems → organs → tissues → cells
Correct Answer: Cells → tissues → organs → systems → organism
Rationale: The levels of structural organization in the human body are hierarchical, beginning
with atoms, then molecules, cells, tissues, organs, systems, and finally the organism . Cells are
the basic unit of life, and tissues are groups of similar cells performing a common function.
4. Which type of chemical bond is characterized by the transfer of electrons from one atom to
another?
A) Covalent bond
B) Hydrogen bond
C) Ionic bond
D) Peptide bond
Correct Answer: Ionic bond
Rationale: An ionic bond is formed when electrons are transferred from one atom to another,
creating ions with positive and negative charges that are attracted to each other . In contrast,
covalent bonds involve the sharing of electrons, while hydrogen bonds are weak attractions
between polarized molecules.
, 5. According to the syllabus, which of the following topics is covered in Unit 1 of the NU 110
course?
A) The Lymphatic and Immune System
B) Chemistry, Matter, and Life
C) The Musculoskeletal system
D) The Endocrine System
Correct Answer: Chemistry, Matter, and Life
Rationale: The syllabus for NU 110 clearly outlines that Exam 1 covers Units 1, 2, and 3. Unit 1
specifically focuses on the "Organization of the Human Body" and "Chemistry, Matter, and Life" .
The other topics listed are part of later units.
6. What is the main function of ribosomes within a cell?
A) To package proteins for secretion
B) To clean up cellular waste and kill germs
C) To synthesize proteins
D) To produce the energy currency ATP
Correct Answer: To synthesize proteins
Rationale: Ribosomes are the cellular structures responsible for protein synthesis, often referred
to as the "anabolic" site . This process involves translating genetic information from mRNA to
build polypeptide chains. Other organelles like mitochondria and the Golgi apparatus have
different primary functions.
7. Which directional term means "toward the belly surface at the front of the body"?
A) Superior
mechanism in the human body?
A) To promote the completion of a response initiated by a particular stimulus
B) To maintain a state of dynamic equilibrium and consistency despite changing environments
C) To amplify a change from a set point to produce a rapid physiological response
D) To initiate the response to a stimulus by sending signals to the effector
Correct Answer: To maintain a state of dynamic equilibrium and consistency despite changing
environments
Rationale: Negative feedback is the main method for maintaining homeostasis, working to
reverse a change from a set point . This is in contrast to positive feedback, which promotes the
completion of a response. The sensor, control center, and effector work together in this loop to
restore balance .
2. The lungs are located in which of the following body cavities?
A) Abdominal cavity
B) Pelvic cavity
C) Thoracic cavity
D) Mediastinum
Correct Answer: Thoracic cavity
Rationale: The thoracic cavity is the superior cavity of the ventral body cavity and houses the
lungs, heart, and other structures . The mediastinum is a subdivision of the thoracic cavity that
specifically contains the heart, but the lungs are in the broader thoracic cavity itself .
,3. What is the correct sequence of structural organization in the human body from simplest to
most complex?
A) Cells → tissues → organs → systems → organism
B) Tissues → cells → organs → organism → systems
C) Organs → tissues → cells → systems → organism
D) Organism → systems → organs → tissues → cells
Correct Answer: Cells → tissues → organs → systems → organism
Rationale: The levels of structural organization in the human body are hierarchical, beginning
with atoms, then molecules, cells, tissues, organs, systems, and finally the organism . Cells are
the basic unit of life, and tissues are groups of similar cells performing a common function.
4. Which type of chemical bond is characterized by the transfer of electrons from one atom to
another?
A) Covalent bond
B) Hydrogen bond
C) Ionic bond
D) Peptide bond
Correct Answer: Ionic bond
Rationale: An ionic bond is formed when electrons are transferred from one atom to another,
creating ions with positive and negative charges that are attracted to each other . In contrast,
covalent bonds involve the sharing of electrons, while hydrogen bonds are weak attractions
between polarized molecules.
, 5. According to the syllabus, which of the following topics is covered in Unit 1 of the NU 110
course?
A) The Lymphatic and Immune System
B) Chemistry, Matter, and Life
C) The Musculoskeletal system
D) The Endocrine System
Correct Answer: Chemistry, Matter, and Life
Rationale: The syllabus for NU 110 clearly outlines that Exam 1 covers Units 1, 2, and 3. Unit 1
specifically focuses on the "Organization of the Human Body" and "Chemistry, Matter, and Life" .
The other topics listed are part of later units.
6. What is the main function of ribosomes within a cell?
A) To package proteins for secretion
B) To clean up cellular waste and kill germs
C) To synthesize proteins
D) To produce the energy currency ATP
Correct Answer: To synthesize proteins
Rationale: Ribosomes are the cellular structures responsible for protein synthesis, often referred
to as the "anabolic" site . This process involves translating genetic information from mRNA to
build polypeptide chains. Other organelles like mitochondria and the Golgi apparatus have
different primary functions.
7. Which directional term means "toward the belly surface at the front of the body"?
A) Superior
